Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ccfa33e103cdbb2…

MALICIOUS

PDF

44.5 KB Created: 2020-08-07 05:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1800c57c94bdf1bb3c5081e3e4362b79 SHA-1: fa52daf05ff091c36a8db3ece4ed60858e34e281 SHA-256: 8ccfa33e103cdbb2f217fc8f1b570b7c74664b364d04092dc4e4bfa583dd9411
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to a redirector service. The document body text, though garbled, includes a URL that appears to be a search query for 'good cheap tablet for reading pdfs', which is likely a lure. The primary malicious URL identified is https://ttraff.cc/pify?keyword=good+cheap+tablet+for+reading+pdfs, which is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=good+cheap+tablet+for+reading+pdfs
    • http://files.saint-anns.com/uploads/1/3/0/8/130814714/183e98b0e5173.pdf
    • http://files.jamesportcigarco.com/uploads/1/3/0/7/130740563/5d4b92.pdf
    • http://files.playhouseofwilson.com/uploads/1/3/1/3/131398259/df8c9ebf535fc05.pdf
    • http://files.patchesfamilycreamery.com/uploads/1/3/0/7/130776343/f2cb181f8.pdf
    • http://lovafuson.lovelocalnashville.com/uploads/1/3/1/0/131070450/e8c50b360.pdf
    • https://cdn.shopify.com/s/files/1/0429/1667/5740/files/kefima.pdf
    • https://cdn.shopify.com/s/files/1/0439/1701/7243/files/fitelin.pdf
    • https://cdn.shopify.com/s/files/1/0436/1335/6194/files/51213650453.pdf
    • https://cdn.shopify.com/s/files/1/0428/5035/3318/files/definition_of_economics_by_different_authors.pdf
    • https://cdn.shopify.com/s/files/1/0433/5920/7582/files/honey_by_bobby_goldsboro.pdf
    • https://cdn.shopify.com/s/files/1/0434/6858/7174/files/symbol_for_euros.pdf
    • https://cdn.shopify.com/s/files/1/0439/3458/0891/files/34041241263.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/girotimovu.pdf
    • https://cdn.shopify.com/s/files/1/0436/9865/1288/files/nofuxopidaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20931566490.pdf
    • https://cdn.shopify.com/s/files/1/0430/1602/8309/files/43418843264.pdf
    • https://cdn.shopify.com/s/files/1/0430/4509/3533/files/jekukamovide.pdf
    • https://cdn.shopify.com/s/files/1/0427/8091/7926/files/nowugozalu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e14.bin
ae897e63fad7afa8c4e51ea7b1be5452d03e30448035ee42039f67daa8ac0e0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E14 5588 bytes
font_01_sfnt_off0000810d.bin
2a41c5eef85cc9f0e8725cb72041c10febf486037130edbe139b975700b1fd60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x810D 10352 bytes

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